The Underwater Dragon King Cannon

original: 水底龍王砲 (Shuidi Longwang Pao). This heading refers to a sophisticated naval mine, though the text below it concludes the description of the previous weapon, the Fire Dragon rocket.

Compendium of Military Preparations, Volume 123

The Wubei Zhi is a comprehensive military encyclopedia compiled by Mao Yuanyi in 1621.

Military Assets: Fire — Illustrated Descriptions of Firearms, Part 12

When the propellant original: 藥 (yào); literally "medicine," the standard term for gunpowder in historical Chinese texts in the booster tubes is nearly exhausted, the rocket-arrows (huojian)Huojian; these are the secondary projectiles housed within the dragon's body. They function as a second-stage ignition, triggered by the final sparks of the primary booster engines. inside the "belly" of the dragon fly out. Both the enemy personnel and their ships are simultaneously incinerated. This device is designed for use on both water and land.